Integrated fertilizer prescriptions through targeted yield model and prediction of post-harvest soil test values for Kharif Rice (Oryza sativa) Mondal Sudeshna*, Gorai Debjit, Saha Niharendu1, Dasgupta Shubhadip, Bhattacharyya Kallol, Dey Pradip2 AICRP on Soil Test Crop Response Correlation, Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, 741235, West Bengal 1Present address Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, 741252, West Bengal 2AICRP on Soil Test Crop Response Correlation, Indian Institute of Soil Science, Bhopal, 462038, Madhya Pradesh *Corresponding author Email: mondal.sudeshna2010@gmail.com
Online published on 23 March, 2021. Abstract A field experiment was conducted during 2017-18 on an Aeric Haplaquept soil of West Bengal by adopting the inductive cum targeted yield model, and fertilizer requirements were quantiûed for rice (Oryza sativa) based on soil test and yield target. The basic parameters such as nutrient requirement (NR) and contributions of nutrients from soil (Cs), fertilizer (Cf) and vermicompost (Cvc) were computed from the field experimental data and it was found that the contribution of fertilizer-source to the total NPK uptake in rice was far higher than that obtained from vermicompost and soil available sources. Using pre-sowing soil test values, fertilizer doses and grain yield and/or NPK uptake by the crop as independent variables and post-harvest soil test values as dependent variable, PHSTVs prediction equations were developed. Significant R2 values were recorded for prediction equations which showed that these equations could be used for the prediction of post-harvest KMnO4-N, Olsen-P and NH4OAc-K. Top Keywords Rice, Target yield, Fertilizer-prescription, Ready-reckoner, Prediction-equation, Inceptisol. Top |